Stephen J Macdonald, 6117 Norseman Dr, Portsmouth, RI 02871

6485543, Nov 26, 2002

Sep 16, 2000

09/663425

Stephen J. MacDonald - Salem NH, 03079
Peter Germano - Northborough MA
Edwin Jahngen - Kingston NH

Stephen J. MacDonald - Salem NH

B01D 1508

95 87, 96102

A gas chromatography system with suspended tubular separation column(s) in an enclosed convection oven where a gas medium is heated by at least two electrically powered heaters. A kit to modify gas chromatographic ovens for operation with at least two electrically powered heaters. The heaters are positioned to promote even heating along the length of the column(s) and shielding of the column(s) from radiant heat. The heaters can provide faster heating rates at elevated temperatures.

7935536, May 3, 2011

Jul 27, 2005

11/190513

Robert S. Johnson - Hampstead NH, US
Stephen MacDonald - Hudson NH, US

HorizonTechnology, Inc. - Salem NH

C12Q 1/00

436174, 435 4, 4352871, 4352831, 422 681, 422 50

An apparatus and method for separating residual water from a solvent and removing a solvent. The apparatus may be sealed and automated. The method comprises providing a solution comprising solvent and residual water and an analyte. The solution may be passed through a membrane to reduce water content wherein an analyte is present at a first concentration. This then may be followed by removing solvent from the solution.

5418170, May 23, 1995

Apr 22, 1993

8/051209

David P. Rounbehler - Bedford MA
Eugene K. Achter - Lexington MA
David H. Fine - Sudbury MA
Freeman W. Fraim - Lexington MA
Stephen J. MacDonald - Salem NH
Helmut W. Klotzsch - Groton MA

The Coca-Cola Company - Atlanta GA

G01N 2176
G01N 3502

436111

A method and system for injecting liquid into containers and for inspecting containers for the presence of certain substances such as potential contaminants such as ammonium salts or amine salts in glass or plastic bottles. A high speed system and method are provided for detecting these contaminants in these bottles. Ammonia and amines can be detected by chemiluminescence of samples of volatiles emitted from the bottles during the high speed inspection process. A solution of Na. sub. 2 CO. sub. 3 is injected into the bottles in order to enhance the conversion of ammonium or amine salts to free ammonia or amines which are then released as vapors. This enhances the likelihood that a gas-phase detection system such as one using chemiluminescence detection techniques will detect the presence of contaminants containing ammonium salts or amine salts.

5397540, Mar 14, 1995

Mar 21, 1994

8/215362

David P. Rounbehler - Bedford MA
Eugene K. Achter - Lexington MA
David H. Fine - Sudbury MA
Freeman W. Fraim - Lexington MA
Stephen J. MacDonald - Salem NH
Helmut W. Klotzsch - Groton MA

The Coca-Cola Company - Atlanta GA

G01N 2101

422 8208

A system for injecting liquid into containers moving through an inspection station at variable speeds without spilling liquid over the outside of, or between, the containers for inspecting the containers for the presence of certain substances such as potential contaminants, such as ammonium salts or amine salts in glass or plastic bottles. The movements of each container is tracked with sensors upstream of a high speed injector, and one or more nozzles is timed to inject liquid in a narrow, high velocity stream only while the top opening of a container is under the nozzle(s). The liquid is employed to enhance liberation of vapors from within the containers for detection of the contaminants in the containers.

5808178, Sep 15, 1998

Oct 16, 1996

8/731573

David P. Rounbehler - North Chelmsford MA
Eugene K. Achter - Lexington MA
David H. Fine - Lincoln MA
George B. Jarvis - Arlington MA
Stephen J. MacDonald - Salem NH
David B. Wheeler - Lunenburg MA
Clayton D. Wood - Framingham MA

Thermedics Detection Inc. - Chelmsford MA

G01N 3060
G01N 3054

73 2339

A high speed gas chromatography system includes a heated isothermal region and a gas chromatography column located externally to the isothermal region. The system also includes a detector and a flow path between the column and the detector. At least a portion of the flow path is positioned in the isothermal region.

5470754, Nov 28, 1995

Feb 22, 1993

8/020804

David P. Rounbehler - Bedford MA
David H. Fine - Sudbury MA
Eugene K. Achter - Lexington MA
Stephen J. MacDonald - Salem NH
Daniel B. Dennison - Kennesaw GA

The Coca-Cola Company - Atlanta GA

G01N 2176

436106

A system and method are provided for minimizing the effects of background signals in masking signals indicating the presence of substances to be detected such as contaminants in materials moving rapidly along a conveyor. The contaminants detected may include nitrogen containing compounds and hydrocarbons. The system and method of the present invention minimize during detection of the presence or absence of such substances, the number of falsely positive indications of the presence of such substances due to background signals and changes in background signals. The substances detected are divided into first and second sample portions and the respective portions are heated. The first heated portion is mixed with ozone to cause a chemical reaction therewith in order to generate radiation by chemiluminescence having characteristic wavelengths related to substances in the first portion. The second portion heated is also mixed with ozone to cause a chemical reaction therewith in order to generate radiation by chemiluminescence having characteristic wavelengths related to substances in the second portion. The radiation of the respective first and second portions is selectively detected.

5561068, Oct 1, 1996

Apr 4, 1995

8/416573

David P. Rounbehler - Bedford MA
David H. Fine - Sudbury MA
Eugene K. Achter - Lexington MA
Stephen J. MacDonald - Salem NH
Daniel B. Dennison - Kennesaw GA

The Coca-Cola Company - Atlanta GA

G01N 2176

436139

A system and method for minimizing the effects of background signals in masking signals indicating the presence of substances to be detected such as contaminants in materials moving rapidly along a conveyor. The contaminants detected may include nitrogen containing compounds and hydrocarbons. The system and method minimize, during detection of the presence or absence of such substances, the number of falsely positive indications of the presence of such substances due to background signals and changes in background signals. The substances detected are divided into first and second sample portions and the respective portions are heated. The first heated portion is mixed with ozone to cause a chemical action therewith in order to generate radiation by chemiluminescence having characteristic wavelengths related to substances in the first portion. The second portion heated is also mixed with ozone to cause a chemical reaction therewith in order to generate radiation by chemiluminescence having characteristic wavelengths related to substances in the second portion. The radiation of the respective first and second portions is selectively detected.

5493890, Feb 27, 1996

Mar 16, 1994

8/213988

Daniel A. Dussault - Newburyport MA
William A. Curby - Boston MA
Stephen J. MacDonald - Salem NH
Edward E. A. Bromberg - Peabody MA

Thermedics Detection Inc. - Chelmsford MA

G01N 3394
G01N 3700

73 1G

A method and apparatus for calibrating contraband vapor/particle detection devices is described. The invention includes a desorb site onto which may be deposited solutions containing known concentrations of one or more of the specific compounds to be detected. The desorb site, which may be rapidly heated to vaporize the particles contained in the solution deposited on its surface, is housed in a sealable chamber. The vapor and/or particles become entrained in an air stream forced across the surface of the desorb site, and the airstream is then delivered through a snout to the contraband vapor particle detector.